Liquid nitrogen

Nitrogen gas that has been converted to a colourless liquid by cooling it to a temperature below 196ºC.

Liquid is the highest purity form in which nitrogen is supplied. It is also far more efficient to store nitrogen as a liquid rather than as a compressed gas since each volume of liquid will give 682 volumes of gas when it is converted to gas at room temperature and atmospheric pressure.

Liquid nitrogen is frequently used as a refrigerant in sub-zero treating and as a source of very pure nitrogen gas. Nitrogen derived from liquid is very much heavier than air owing to its very low temperature.